Just tell any nosy busy-bodies you operate an electric kiln periodically to make things to sell to help bring in surplus income. I too was questioned about my $300 elec bills when I received a letter asking about possible problems with the house electrical wiring/system and I told them just that...I'm a part time potter (lol, not far from the truth there) and use an oven usually only during the cooler times but sometimes I have orders needing to be filled and must run it during the day too. This was 3 years ago and there have been no questions since.